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Epigenetics and Communication Mechanisms in Microglia Activation with a View on Technological Approaches
Sabrina Petralla1, Francesca De Chirico1, Andrea Miti1
1Department of Pharmacy and Biotechnology, University of Bologna, 40126 Bologna, Italy.
Abstract:
Microglial cells, the immune cells of the central nervous system (CNS), play a crucial role for the proper brain development and function and in CNS homeostasis. While in physiological conditions, microglia continuously check the state of brain parenchyma, in pathological conditions, microglia can show different activated phenotypes: In the early phases, microglia acquire the M2 phenotype, increasing phagocytosis and releasing neurotrophic and neuroprotective factors. In advanced phases, they acquire the M1 phenotype, becoming neurotoxic and contributing to neurodegeneration. Underlying this phenotypic change, there is a switch in the expression of specific microglial genes, in turn modulated by epigenetic changes, such as DNA methylation, histones post-translational modifications and activity of miRNAs. New roles are attributed to microglial cells, including specific communication with neurons, both through direct cell-cell contact and by release of many different molecules, either directly or indirectly, through extracellular vesicles. In this review, recent findings on the bidirectional interaction between neurons and microglia, in both physiological and pathological conditions, are highlighted, with a focus on the complex field of microglia immunomodulation through epigenetic mechanisms and/or released factors. In addition, advanced technologies used to study these mechanisms, such as microfluidic, 3D culture and in vivo imaging, are presented.
Insights
Microglia, the brain's immune cells, shift between protective (M2) and damaging (M1) states, influencing neurodegeneration. Epigenetic changes and neuron-microglia communication drive these crucial shifts in the central nervous system (CNS).
Area of Science:
- Neuroscience
- Immunology
- Cell Biology
Background:
- Microglial cells are key immune cells in the central nervous system (CNS), essential for brain development, function, and homeostasis.
- Microglia exhibit dynamic phenotypes (M2 and M1) during physiological and pathological conditions, impacting neuroprotection and neurodegeneration.
- Epigenetic mechanisms, including DNA methylation, histone modifications, and microRNAs, regulate microglial gene expression and function.
Purpose of the Study:
- To review recent findings on the bidirectional interactions between neurons and microglia in both health and disease.
- To highlight the role of microglia immunomodulation through epigenetic mechanisms and secreted factors.
- To present advanced technologies for studying these complex neuro-immune interactions.
Main Methods:
- Literature review focusing on neuro-immune interactions and microglial immunomodulation.
- Analysis of epigenetic mechanisms (DNA methylation, histone modifications, miRNAs) affecting microglial phenotypes.
- Discussion of advanced technologies like microfluidics, 3D cultures, and in vivo imaging.
Main Results:
- Microglia transition between M2 (neuroprotective) and M1 (neurotoxic) phenotypes, influencing CNS health and disease progression.
- Bidirectional communication between neurons and microglia occurs via direct contact and molecular signaling, including extracellular vesicles.
- Epigenetic modifications are central to regulating microglial responses and their contribution to neurodegeneration.
Conclusions:
- Understanding neuron-microglia interactions and epigenetic regulation is critical for deciphering CNS homeostasis and pathology.
- Advanced technologies offer new avenues for investigating microglial function and developing therapeutic strategies.
- Microglia play a pivotal role in CNS health and disease, with their immunomodulatory functions being a key area of research.
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